Clown Gobys work fine, as does rainford goby, lots of varous blennys, especially the yasha hasha goby and shrimp pair. Yellow, black, green, citron clown gobies and watchman are good as is neon types. I tend to stick with pepermint or sexy shrimp, astrea snails, or cerith snails, and blue leg hermits and a nassarius snail or so. I try and add serpent brittle stars or even asterina stars. I have a skunk clown in one of them for over two years now. Its obsessed with a frilly mushroom which it calls home. The skunk clown is still no more than perhaps 1.5 inches in length......which is what the skunk clown in a larger tank is, so its not a bad fish for a small tank either.